Techniques are described for wireless communication. A method for wireless communication at a user equipment (UE) includes transmitting precoder selection signals from at least two antennas of the UE during performance of a random access procedure over a wireless network; and receiving, from the wireless network during the random access procedure, an indication of a refined precoding setting for the UE. A method for wireless communication at a network access device includes receiving, from a UE during a random access procedure performed by the UE, precoder selection signals from at least two antennas of the UE; identifying a refined precoding setting for the UE based at least in part on the received precoder selection signals; and transmitting an indication of the refined precoding setting to the UE.
Legal claims defining the scope of protection, as filed with the USPTO.
1. A method for wireless communication at a network access device, comprising: receiving, from a user equipment (UE) during a random access procedure performed by the UE, precoder selection signals from at least two antennas of the UE, at least one of the precoder selection signals comprising a first measurement reference signal (MRS) from a first antenna of the UE; determining a refined precoding setting based at least in part on the first MRS and the received precoder selection signals; and transmitting an indication of the refined precoding setting to the UE.
2. The method of claim 1 , wherein at least one of the precoder selection signals comprises a second MRS from a second antenna of the UE.
3. The method of claim 1 , wherein the first MRS is received with at least one of: a physical random access channel (PRACH) transmission, or an enhanced PRACH (ePRACH) transmission, or an initial physical uplink shared channel (PUSCH) transmission, or a combination thereof.
4. The method of claim 1 , further comprising: receiving, from the UE during the random access procedure, an ePRACH transmission or an initial PUSCH transmission using a first precoder based at least in part on the indication of the refined precoding setting, or a second precoder used by the UE during a prior successful random access procedure.
5. The method of claim 1 , further comprising transmitting the indication of the refined precoding setting to be applied to a transmission during the random access procedure.
6. The method of claim 1 , further comprising transmitting the indication of the refined precoding setting to be applied to a transmission following the random access procedure.
7. A method for wireless communication at a network access device, comprising: receiving, from a user equipment (UE) during a random access procedure performed by the UE, precoder selection signals from at least two antennas of the UE; identifying a refined precoding setting for the UE based at least in part on the received precoder selection signals; and transmitting an indication of the refined precoding setting to the UE.
8. The method of claim 7 , further comprising: transmitting, during performance of the random access procedure, a transmission comprising at least one of: a random access response (RAR) grant, downlink control information (DCI) scheduling information for an initial physical uplink shared channel (PUSCH) transmission of the UE, or a combination thereof.
9. The method of claim 8 , wherein the transmission comprises at least one precoder selection signal parameter, the at least one precoder selection signal parameter comprising: a bandwidth of the precoder selection signals, a cyclic shift of the precoder selection signals, a number of antenna ports from which to transmit the precoder selection signals, or a combination thereof.
10. The method of claim 9 , wherein the transmission comprises the indication of the refined precoding setting.
11. The method of claim 7 , further comprising: receiving at least one transmission from the UE in accordance with the indicated refined precoding setting, the at least one transmission comprising: an initial PUSCH transmission, a retransmission of the initial PUSCH transmission, or a combination thereof.
12. The method of claim 7 , wherein the refined precoding setting is identified based at least in part on: the precoder selection signals, prior-transmitted precoder selection signals transmitted during a prior random access procedure, or a combination thereof.
13. A method for wireless communication at a network access device, comprising: receiving, from a user equipment (UE) during a random access procedure performed by the UE, precoder selection signals from at least two antennas of the UE; and transmitting an indication of a refined precoding setting to the UE based at least in part on the received precoder selection signals; and transmitting system information including a first indication of a first set of resources associated with a single antenna random access procedure and a second indication of a second set of resources associated with multiple antenna random access procedures.
14. The method of claim 13 , further comprising: transmitting system information including: a first indication that precoder selection signal reception is enabled, a second indication of a type of precoder selection signal reception that is enabled, or a combination thereof, wherein the precoder selection signals are received in response to transmitting at least the first indication or the second indication.
15. The method of claim 13 , further comprising identifying a capability of the UE based at least in part on the received precoder selection signals.
16. The method of claim 15 , wherein the precoder selection signals are received with at least one of: a physical random access channel (PRACH) transmission, or an enhanced PRACH (ePRACH) transmission, or an initial physical uplink shared channel (PUSCH) transmission, or a combination thereof.
17. A method for wireless communication at a network access device, comprising: receiving, from a user equipment (UE) during a random access procedure performed by the UE, precoder selection signals from at least two antennas of the UE, the precoder selection signals comprising a first demodulation reference signal (DMRS) and a first part of a data transmission received from at least a first antenna of the UE in accordance with a first precoder and a preconfigured precoder cycling; and transmitting an indication of a refined precoding setting to the UE based at least in part on the received precoder selection signals.
18. The method of claim 17 , wherein the precoder selection signals further comprise a second DMRS and a second part of the data transmission received from at least a second antenna of the UE, in accordance with a second precoder and the preconfigured precoder cycling, the second precoder being different from the first precoder.
19. The method of claim 18 , wherein receiving the precoder selection signals comprises: receiving the first DMRS and the first part of the data transmission from the first antenna of the UE, in accordance with a preconfigured antenna rotation; and receiving the second DMRS and the second part of the data transmission from the second antenna of the UE, in accordance with the preconfigured antenna rotation.
20. The method of claim 18 , further comprising: determining a first error rate associated with the first part of the data transmission; and determining a second error rate associated with the second part of the data transmission, wherein the indication of the refined precoding setting is based at least in part on the first error rate and the second error rate.
21. The method of claim 17 , wherein the data transmission comprises a data payload of an ePRACH transmission or an initial physical uplink shared channel (PUSCH) transmission.
22. A method for wireless communication at a user equipment (UE), comprising: transmitting, during a random access procedure, precoder selection signals from at least two antennas of the UE, at least one of the precoder selection signals comprising a first measurement reference signal (MRS) from a first antenna of the UE; and receiving, during the random access procedure, an indication of a refined precoding setting based at least in part on the transmitted precoder selection signals comprising the first MRS.
23. The method of claim 22 , wherein at least one of the precoder selection signals comprises a second MRS from a second antenna of the UE.
24. The method of claim 22 , wherein the first MRS is transmitted with at least one of: a physical random access channel (PRACH) transmission, or an enhanced PRACH (ePRACH) transmission, or an initial physical uplink shared channel (PUSCH) transmission, or a combination thereof.
25. The method of claim 22 , further comprising: transmitting, during the random access procedure, an ePRACH transmission or an initial PUSCH transmission using a first precoder based at least in part on the indication of the refined precoding setting, or a second precoder used by the UE during a prior successful random access procedure.
26. The method of claim 22 , further comprising applying the refined precoding setting to a transmission during the random access procedure.
27. The method of claim 22 , further comprising applying the refined precoding setting to a transmission following the random access procedure.
28. A method for wireless communication at a user equipment (UE), comprising: transmitting, during a random access procedure, precoder selection signals from at least two antennas of the UE; receiving, during the random access procedure, a transmission comprising a refined precoding setting based at least in part on the transmitted precoder selection signals.
29. The method of claim 28 , wherein the transmission comprises at least one of: a random access response (RAR) grant, downlink control information (DCI) scheduling information for an initial physical uplink shared channel (PUSCH) transmission of the UE, or a combination thereof.
30. The method of claim 29 , wherein the transmission comprises at least one precoder selection signal parameter, the at least one precoder selection signal parameter comprising: a bandwidth of the precoder selection signals, a cyclic shift of the precoder selection signals, a number of antenna ports from which to transmit the precoder selection signals, or a combination thereof.
31. The method of claim 28 , further comprising: transmitting, during performance of the random access procedure, an initial PUSCH transmission, a retransmission of the initial PUSCH transmission, or a combination thereof comprising the precoder selection signals, wherein the precoder selection signals are transmitted with the initial PUSCH transmission and are based at least in part on at least one precoder selection signal parameter.
32. The method of claim 28 , wherein the refined precoding setting is based at least in part on: the precoder selection signals, prior-transmitted precoder selection signals transmitted during a prior random access procedure, or a combination thereof.
33. A method for wireless communication at a user equipment (UE), comprising: transmitting, during a random access procedure, precoder selection signals from at least two antennas of the UE; and receiving, during the random access procedure, an indication of a refined precoding setting based at least in part on the transmitted precoder selection signals; and receiving system information including a first indication of a first set of resources associated with a single antenna random access procedure and a second indication of a second set of resources associated with multiple antenna random access procedures.
34. The method of claim 33 , further comprising: identifying a set of resources associated with multiple antenna random access procedures based at least in part on receiving the system information, wherein the random access procedure comprises transmitting at least one of a PRACH or an ePRACH on the identified set of resources.
35. The method of claim 33 , further comprising: receiving system information including: a first indication that precoder selection signal reception is enabled, a second indication of a type of precoder selection signal reception that is enabled, or a combination thereof, wherein the precoder selection signals are transmitted in response to receiving at least the first indication or the second indication.
36. The method of claim 33 , wherein the precoder selection signals are transmitted with at least one of: a physical random access channel (PRACH) transmission, or an enhanced PRACH (ePRACH) transmission, or an initial physical uplink shared channel (PUSCH) transmission, or a combination thereof.
37. A method for wireless communication at a user equipment (UE), comprising: transmitting, during a random access procedure, precoder selection signals from at least two antennas of the UE, the precoder selection signals comprising a first demodulation reference signal (DMRS) and a first part of a data transmission transmitted from at least a first antenna of the UE in accordance with a first precoder and a preconfigured precoder cycling; and receiving, during the random access procedure, an indication of a refined precoding setting based at least in part on the received precoder selection signals.
38. The method of claim 37 , wherein the precoder selection signals further comprise a second DMRS and a second part of the data transmission transmitted from at least a second antenna of the UE, in accordance with a second precoder and the preconfigured precoder cycling, the second precoder being different from the first precoder.
39. The method of claim 38 , wherein transmitting the precoder selection signals comprises: transmitting the first DMRS and the first part of the data transmission from the first antenna of the UE, in accordance with a preconfigured antenna rotation; and transmitting the second DMRS and the second part of the data transmission from the second the UE, in accordance with the preconfigured antenna rotation.
40. The method of claim 37 , wherein the indication of the refined precoding setting is based at least in part on a first error rate and a second error rate.
41. The method of claim 37 , wherein the data transmission comprises a data payload of an ePRACH transmission or an initial physical uplink shared channel (PUSCH) transmission.
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September 1, 2017
September 24, 2019
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